Sand-blast carving and method of making the same



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Patented July 9, 1929.

UNITED STATES 1,720,569 PATENT OFFICE.

GEORGE RANNIE PHILIP, OF NORTHFIELD, VERMONT, ASSIGNOR TO CROSS BROTHERS GOMIPANY, 0F NORTHFIELD, VERMONT, A CORPORATION 0F VERMONT.

sANnBLAsr oaiwnve Ann METHOD or MAKING 'ri-1E SAME.

Application filed September 18, 1928.

This invention relates to sand blast carvin and method of making the same and has .more particular reference to relief carvings in stone although of course the invention is applicable to other material, but to avoid repetition I shall hereinafter refer to the material as stone.

An object of my invention is to carve, by sand blast,leaves, flowers and other designs which have a sharp edge, or, more specifically, which have an edgein cross section less than a right angle.

A further object of my invention is to provide a sand blast carvinghaving a design formed thereon in relief with the face of the design formed with a sinkage extending to the edge of the design, resulting` in a dcsign having its edge in cross section less than a right angle and its outer edge outlined by a groove in the background, the niateiial. around the outer wall of said groove incliniiig or curving upwardly to a plane higher than the background whereby said groove and said elevated portion of the background around the groove give an attractive effect to the design.

In carrying out my improved :method I employ a coating which is commonly known in the trade as glue and which resists the action of an abrasive blast such as sand, steel shot, silicon, carbide, boxite oi' any other abrasive material in the form of small particles which are blown by a blast against the same.

.It is therefore to be understood that in thedescription and claims where I employ the term coating7 I use it to define a coating which will resist the blast of abrasive material and which will be adhesive so as to adhere to the stone.

In carrying out my invention I employ a transparent or semiftransparent coating through which the outlines in the stone be-` neath can be seen so that cutting of the coat ing and the sand blasting can be accurately performed without the employment of any additional means to locate the design below the coating. y

I also employ a coating, such as is in common use, which is not transparent, and to distinguish the two coatings I shall refer to one as a transparent coating and the other as an opaque coating.

My invention consists in certain novel features of construction in the carving and cer- Serial No. 306,889.

the lines will be left when the coating covering the design and baclrgi'ound'is removed. lhis Figure l also shows a portion of the coating' removed from that portion ofthe stone which constitutes the background of the design.

` `Figure 2 is a view in transverse section on the line 2 2 of Figure l, with the coating re- `inoved from 'the background and the backd ground blown down the desired distance.

.Figure 3 is a plan viewshowing the stone with all coating removed therefrom except such coating as remains between the spaced lilies around the design; and also illustrates the background blown down and a sinkage formed in the design.

Figure 4t is a view in section on the line Li-4 of Figure 3.

Figure 5 is a plan view showing the next step of the method with the background and design covered by transparent coating. In this view the opaque coating between the .spaced lines aroundtlie design have been removed aiid a groove formed `in the traiis- `parent coating by this removal of the opaque coatinghas been enlarged slightly so as to expose a portion of the background; also in `this View the coating has been removed to form the veins of the leaf design.

Figure 6 is a view in section oii the line 6-6 of Figure 5.

Figure 7 is a plan view of the article after it has been subjected to a sand blast to blow down the outline groove of the design and the groove or grooves forming the veins ofthe design.

Figure 8 is a view in section on the line SWS of Figure 7.

Figure 9 is a plan view of the finished work. Figure 10 is a view in section on the line 1 0-1() of Figure 9.

In carrying out .my improved method I locate on the surface of a stone l an opaque coating 2 of the desired thickness and allow this coating to dry. To prevent repetition we will assume that the design constitutes a leaf.

After the coating is dry, a leaf or stencil thereof is placed on the coating and the coating is cut around the leaf by a knife or other instrument, -this cut line being indicated by the reference character 3. A second line, indicated by the reference character 4, is cut around the line 3 and ,spaced therefrom a short distance, say, for example, one-sixteenth of an inch. f

The `next step in the operation is to remove the coating from the surface of the stone around the outer line or cut 4, and then subject the stone to the action of sand blasting,

blowing down this exposed surface of the stone a short distance in the operation of forming a background on the stone for the desiUn. This step in the method is indicated by Figure 2 of the drawings.

The next step in the method is to remove the coating outlinedby the inner line or cut 3, and again subject the stone to the action of a. sand blast to blow down further the background 5 and also form a sinkage 6 in the design which gives the surface shape to the design. This step is indicated by Figures 3 `and 4, ,and it will be noted that the sand blast operation in blowingdown the background leaves-a curved or inclined surface 7 at the background adjacent the design.

" The next step is to cover the background 5 andlill the sinkage 7 with a transparent coating 8, and after this coating is dry a strip or strips thereof are removed from the intermediate portion of the design to form a vein or veins 9. A- strip of coating isvalso removed above the original surface of the stone and slightly wider than said original surface, so that-theouter wall of the slot thus formed-in the transparent coating cuts across the curvedor inclinedportion of the backgroundur, as cleaily indicated in Figures 5 i and 6 of the drawings, which constitutes the next step in the method'.

The stone is Vthen again subjected to a sand blast to blowa groove or grooves 9 in the designto form the veins of the leaf in the stone and alsov to form outline grooves l0 around the design. Thisstep in the method is indicated in Figures 7 and S of the drawings,

v and I would call attention to the fact that by the method above described the outline groove or grooves 10 extend down into the background, and the background tapers upward- Vly to a sharp edge wheie it joins the outer wall of the groove or grooves 10.

The method 'is now completed after the coating is removed from the stone, and I illustrate in Figures 9 and 10 the finished carving 'in planand in section,`respectively.

Figure l0 illustrates'an important feature of my invention wherein it will be noted that the design formed by the sinkage is outlined by a groove extending into the background and alsoi'by a raised portion of the background at the outer wall of the groove. Thus a double shading etlect is given to the design which is extremely attractive.

I claim:

l. A method of making sand blast carvings, coinprising first locating a coating ou a stone or other article to be carved, then cutting through the coating a line outlining a design and a second line spaced from the Iirst mentioned line, then removing the coating around the outer line, then blowing down the exposed surface of the stione a. desired distance in the formation o'l a background, then removing the coating outlined by the inner line, then subjecting the exposed surfaces ol the stone to a sand blast to make a sinkage in the stone to form the design and to further cut down the background, then covering the exposed surfaces of the stone with a coating and allowing the same to dry, then removing the coating between the two first mentioned lines which outline the design, and then subjecting the exposed surface of the stone, blowing down an outline groove in the stone directly around the sinkage whereby the design'lias a sharp edge.

2. A method of making sand blast carvings, comprising lirst locating an opaque coating on a stone or other article to be carved, then cutting a design by a line or cut extending through the coating, then cuttinga second line outlining the first mentioned line and spaced therefrom, then removing the coating around the outer line, then removing the coating within the inner line, then subjecting the exposed surfaces of the stone, blowing aI sinkage into the stone toform the design and blowing a background into the stone outside of the design, then covering the background and sinkage with a transparent coating and allowing the same to dry, then removing the strip or strips of coating above the sinkage to form an ornamental line and also to remove tlie original opaque coating between the iii-st mentioned lines and around the sinkage, then blowing down the exposed surfaces oi' the stone forming ornamental lines or grooves in the sinkage and forming an outline groove around the sinkage, one wall of said groove directly joining the wall of the sinkage whereby a sharp edge carving is formed, and finally removing.;` all coating fgom the surface of the stone.

3. The method of making sand blast carvings, comprising iirst locating a coating on a stone or other article to be carved, then iemoving portions of the coating forming a. design and another portion of the coating above the stone which forms the background of the design, sin'iultaneously blowing a sinkage in the stone to form a. design in the stone and the background for the stone, the action of the sand blast being such as to remove an inclined or curved wall at the edge of the background adjacent the sinkage, then covering the background and sinkage with a coating, then removing a strip of coating around the sinkage, then. exposing this stone to the action of a sand blast to bloW a groove into the Stone around the sinkage, and which groove also cuts across the inclined or taper ing surface of the background, the inner Wall of said groove meeting the sinkage to forni a sharp edge design, and the outer Wall of the groove meeting the inclined or curved 10 portion of the background whereby a raised portion of the background is :formed around the outline groove.

GEORGE RANNIE PHILIP. 

